$OpenBSD: patch-inetmapi_Makefile_in,v 1.7 2016/04/20 18:38:41 robert Exp $
--- inetmapi/Makefile.in.orig	Wed Apr 20 15:02:27 2016
+++ inetmapi/Makefile.in	Wed Apr 20 19:54:15 2016
@@ -472,7 +472,7 @@ AM_CPPFLAGS = ${ZCPPFLAGS} $(DEBUGFLAGS) $(BOOST_CPPFL
 	-I$(top_srcdir)/mapi4linux/include -I$(top_srcdir)/provider/common \
 	-I${top_srcdir}/common -I${top_srcdir}/m4lcommon \
 	-I${top_srcdir}/libfreebusy -I${top_srcdir}/libicalmapi \
-	-I/usr/include/libxml2
+	$(XML2_CFLAGS)
 
 lib_LTLIBRARIES = libinetmapi.la
 noinst_DATA = libinetmapi.ldd
